libbb/procps.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright 1998 by Albert Cahalan; all rights reserved.
   6  * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
   7  * GNU Library General Public License Version 2, or any later version
   8  *
   9  */
  10
  11 #include <dirent.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <asm/page.h>
  16
  17 #include "libbb.h"
  18
  19 extern procps_status_t * procps_scan(int save_user_arg0)
  20 {
  21         static DIR *dir;
  22         struct dirent *entry;
  23         static procps_status_t ret_status;
  24         char *name;
  25         int n;
  26         char status[32];
  27         char buf[1024];
  28         FILE *fp;
  29         procps_status_t curstatus;
  30         int pid;
  31         long tasknice;
  32         struct stat sb;
  33
  34         if (!dir) {
  35                 dir = opendir("/proc");
  36                 if(!dir)
  37                         error_msg_and_die("Can't open /proc");
  38         }
  39         for(;;) {
  40                 if((entry = readdir(dir)) == NULL) {
  41                         closedir(dir);
  42                         dir = 0;
  43                         return 0;
  44                 }
  45                 name = entry->d_name;
  46                 if (!(*name >= '0' && *name <= '9'))
  47                         continue;
  48
  49                 memset(&curstatus, 0, sizeof(procps_status_t));
  50                 pid = atoi(name);
  51                 curstatus.pid = pid;
  52
  53                 sprintf(status, "/proc/%d/stat", pid);
  54                 if((fp = fopen(status, "r")) == NULL)
  55                         continue;
  56                 if(fstat(fileno(fp), &sb))
  57                         continue;
  58                 my_getpwuid(curstatus.user, sb.st_uid);
  59                 name = fgets(buf, sizeof(buf), fp);
  60                 fclose(fp);
  61                 if(name == NULL)
  62                         continue;
  63                 name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
  64                 if(name == 0 || name[1] != ' ')
  65                         continue;
  66                 *name = 0;
  67                 sscanf(buf, "%*s (%15c", curstatus.short_cmd);
  68                 n = sscanf(name+2,
  69                 "%c %d "
  70                 "%*s %*s %*s %*s "     /* pgrp, session, tty, tpgid */
  71                 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
  72 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
  73                 "%lu %lu "
  74 #else
  75                 "%*s %*s "
  76 #endif
  77                 "%*s %*s %*s "         /* cutime, cstime, priority */
  78                 "%ld "
  79                 "%*s %*s %*s "         /* timeout, it_real_value, start_time */
  80                 "%*s "                 /* vsize */
  81                 "%ld",
  82                 curstatus.state, &curstatus.ppid,
  83 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
  84                 &curstatus.utime, &curstatus.stime,
  85 #endif
  86                 &tasknice,
  87                 &curstatus.rss);
  88 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
  89                 if(n != 6)
  90 #else
  91                 if(n != 4)
  92 #endif
  93                         continue;
  94
  95                 if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
  96                         curstatus.state[1] = 'W';
  97                 else
  98                         curstatus.state[1] = ' ';
  99                 if (tasknice < 0)
 100                         curstatus.state[2] = '<';
 101                 else if (tasknice > 0)
 102                         curstatus.state[2] = 'N';
 103                 else
 104                         curstatus.state[2] = ' ';
 105
 106                 curstatus.rss <<= (PAGE_SHIFT - 10);     /* 2**10 = 1kb */
 107
 108                 sprintf(status, "/proc/%d/cmdline", pid);
 109                 if(save_user_arg0) {
 110                         if((fp = fopen(status, "r")) == NULL)
 111                                 continue;
 112                         if((n=fread(buf, 1, sizeof(buf)-1, fp)) > 0) {
 113                                 if(buf[n-1]=='\n')
 114                                         buf[--n] = 0;
 115                                 name = buf;
 116                                 while(n) {
 117                                         if(((unsigned char)*name) < ' ')
 118                                                 *name = ' ';
 119                                         name++;
 120                                         n--;
 121                                 }
 122                                 *name = 0;
 123                                 if(buf[0])
 124                                         curstatus.cmd = strdup(buf);
 125                                 /* if NULL it work true also */
 126                         }
 127                         fclose(fp);
 128                 }
 129                 return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
 130         }
 131 }
 132
 133 /* END CODE */
 134 /*
 135 Local Variables:
 136 c-file-style: "linux"
 137 c-basic-offset: 4
 138 tab-width: 4
 139 End:
 140 */